It's just too scary to have a cracker cleaning up is mess with
rm -r /*
while your backup is NFS mounted no_root_squash.

For backup I recommend
dirvish
rsync
or
storeBackup

Moreover If you are using cpanel severs it will be fine if use defalut cpanel scripts for taking backups are.
/scripts/cpbackup
/scripts/pkgacct username----->>Backing up
/scripts/restorepkgs-------->>For restoring domain
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We have used NFS mounts to backup to for years with cpanel. We have had no issues at all with server stability. Only thing we have noticed is the backup is bandwidth intensive and will max out a 100mbit connection, but as long as the backups run during the early morning hours you should not notice any issues.

As far as a hacker getting in and removing files its possible but in order to do so they have to get root access which makes this unlikely to happen if your server is secured any at all.

the main thing is to prevent people from scanning the portmapper which can be done via the hosts.allow and hosts.deny file. only allow access to port 111 from your servers and deny it to all others

Does anyone know how rsync works? is it a raid type thing or do you just choose portions of the hard drive to sync up with the other server?

Click to expand...

rsync is more of a "command" per-se than a utility that's running in the background (though you can add a cron job to run rsync for you). The rsync utility works like the cp command in that files are copied. However, unlike the cp command, only files that are detected as newer than those in the destination are actually moved. This is useful because it makes the overall operation faster, and if you are doing this with a remote server, substantially improves bandwidth consumption after the first time you do this.